This is a reply I got a couple of months ago......
Lexus Customer Relations ref: CASE1920879
Dear Mr Rider,
Thank you for your email regarding your Lexus ES and concern with vehicle theft. We certainly understand your reasons for contacting us and appreciate your enquiry.
I understand that a new type of attack against vehicles involves a sophisticated, expensive and custom built electronic device, developed to forcibly gain access to cars. For Lexus, we have seen a push and increase in attacks on the RX model in particular. For the Lexus RX, at present we have a protective 'plate' which has been released as a physical blockage into a commonly attacked area of the Lexus RX.
Even with such a protective plate installed, sadly there is no solution against vehicle theft as a determined criminal will find and develop new and novel ways to enter and steal vehicles.
This development is due to the focussed attack on the RX model by well organised and pre-prepared criminal activity within the M25 region. Regrettably we do not have any information related to this plate for other models including the ES.
We are continuing to look into other developments and protective measures that may help our customers. For the moment we regrettably do not have any other advice we can offer outside of suggestion to look at third party devices which can increase vehicle security. For example, it is widely reported to us by owners and in the press that these "second stage" immobilisers can be effective in preventing a vehicle from being started.
I do hope that this inforamtion is helpful and thank you for contacting Lexus UK.
Kind regards
Craig Allen
Customer Relations Case Manager
Toyota (GB) PLC - Lexus Division